Support CancelCompositionText/ComfirmCompositionText in TSF

ui/base/ime/win/tsf_text_store.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_BASE_IME_WIN_TSF_TEXT_STORE_H_
 #define UI_BASE_IME_WIN_TSF_TEXT_STORE_H_
 
 #include <msctf.h>
 #include <deque>
 
@@ skipping 184 matching lines @@
   // ITfTextEditSink:
   STDMETHOD(OnEndEdit)(ITfContext* context, TfEditCookie read_only_edit_cookie,
                        ITfEditRecord* edit_record) OVERRIDE;
 
   // Sets currently focused TextInputClient.
   void SetFocusedTextInputClient(HWND focused_window,
                                  TextInputClient* text_input_client);
   // Removes currently focused TextInputClient.
   void RemoveFocusedTextInputClient(TextInputClient* text_input_client);
 
+  // Cancels the ongoing composition if exists.
+  bool CancelComposition();
+
+  // Confirms the ongoing composition if exists.
+  bool ConfirmComposition();
+
   // Sends OnLayoutChange() via |text_store_acp_sink_|.
   void SendOnLayoutChange();
 
  private:
   friend class TSFTextStoreTest;
   friend class TSFTextStoreTestCallback;
 
   // Checks if the document has a read-only lock.
   bool HasReadLock() const;
 
@@ skipping 67 matching lines @@
   // attributes of the composition string.
   base::win::ScopedComPtr<ITfCategoryMgr> category_manager_;
   base::win::ScopedComPtr<ITfDisplayAttributeMgr> display_attribute_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(TSFTextStore);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_IME_WIN_TSF_TEXT_STORE_H_